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ไม่มี construct function ใน models/mchatlist.php
หรือ construct มีค่าไม่ครบ

        global $mainframe;
        parent::__construct();
        $id = JRequest::getVar('id', 0, '', 'int');
        $this->setId((int)$id);
       
        $config = JFactory::getConfig();

        // Get the pagination request variables
        $this->setState('limit', $mainframe->getUserStateFromRequest('com_exporter.limit', 'limit', $config->getValue('config.list_limit'), 'int'));
        $this->setState('limitstart', JRequest::getVar('limitstart', 0, '', 'int'));

        // In case limit has been changed, adjust limitstart accordingly
        $this->setState('limitstart', ($this->getState('limit') != 0 ? (floor($this->getState('limitstart') / $this->getState('limit')) * $this->getState('limit')) : 0));

        // Get the filter request variables
        $this->setState('filter_order', JRequest::getCmd('filter_order', 'ordering'));
        $this->setState('filter_order_dir', JRequest::getCmd('filter_order_Dir', 'ASC'));

        $id = JRequest::getVar('id', 0, '', 'int');
        $this->setId((int)$id);